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Regulatory Capital - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2020 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2022
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses |  | $ 1,413,621 | $ 1,416,048 | $ 1,413,621 | $ 1,416,048 | $ 1,339,772 | $ 1,269,652 | $ 1,364,716 | $ 1,357,075
Liability for unfunded commitments |  | 91,959 | 113,847 | 91,959 | 113,847 | 112,962 | $ 49,479 | $ 62,600 | 124,924
Retained earnings |  | 4,034,640 |  | 4,034,640 |  | 3,624,859 |  |  |
Unrealized gain (loss) |  |  |  | (69,000) |  | (115,000) |  |  |
Unrealized loss, tax benefit |  |  |  | 22,000 |  | 37,000 |  |  |
Dividends |  | 116,000 | $ 100,000 | 414,000 | $ 400,000 |  |  |  |
Adjustments |  |  |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |  |
Period of deferment | 2 years |  |  |  |  |  |  |  |
Percentage amount deferred per year | 25.00% |  |  |  |  |  |  |  |
Percentage amount phased in during year | 25.00% |  |  |  |  |  |  |  |
Allowance for credit losses | $ 1,100,000 | (259,536) |  | (259,536) |  | (259,536) |  |  | (259,536)
Liability for unfunded commitments | 116,000 | (26,095) |  | (26,095) |  | (26,094) |  |  | (26,094)
Deferred tax asset | 306,000 | (76,543) |  | (76,543) |  | (76,542) |  |  | (76,542)
Retained earnings | $ 953,000 | $ (209,088) |  | $ (209,088) |  | $ (209,088) |  |  | $ (209,088)

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